RC2014 8085 and Z80

CP/M-IDE for RC2014

Just over 4 years ago, on 18th March 2018, I committed the first CP/M-IDE files into the RC2014 repository. Now that some time has passed and it has developed into a stable solution for CP/M I think it is time to fill in some details about why it was written, how it differs from other […]

8085 Software

This covers creation of software support for the 8085 CPU within the framework of the z88dk and also with MS BASIC 4.7. Specifically, the 8085 undocumented instructions will be covered, and some usage possibilities provided. Future work is to build a re-entrant IEEE floating point library specifically using the stack relative instructions found in the […]

8085 CPU on the Z80 Bus

Generating Z80 /IORQ and /MREQ from 8085 signals. Generating a waitstate to support Z80 peripherals to the 8085 CPU Module.

8085 CPU based ISSF Target Turner

My club uses pneumatic systems to turn the ISSF Targets, which are controlled by a timing system. One of the members asked me to help build a phone interface for the systems. The systems are used for many courses of fire, and there are quite a few options to manage. On the front panel there […]

Three Rings for the Z80

Over the past few years I’ve implemented a number of interfaces for Z80 peripherals based on the principal of the interrupt driven ring buffer. Each implementation of a ring exhibits its own peculiarities, based on the specific hardware. But essentially I have but one ring to bring them all and in the darkness bind them. […]

Testing MicroPro TL866

Part of the learning experience around the Z80 processor is to get a good understanding of the methods used to program the EEPROM or Flash memory used to drive old style processors. To that end, I have purchased a MicroPro TL866 programmer. The TL866 is produced in China by the AutoElectric company. There is a […]

RC2014 Troubleshooting

So I soldered it all together, and it doesn’t work. Typical. It looked so easy, all of the instructions are straightforward, and the boards are clear and labeled for easy assembly. I guess this is the story for many projects and some of them never proceed past this point and end up in the junk […]

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